简介：ＧＲＥＥＮＩＮＧＴＨＥＬＯＥＳＳＰＬＡＴＥＡＵ：ＦＯＵＲ“ＧＯＬＤＥＮＦＬＯＷＥＲＳ”￥ＢｙＺｈｕＪｉａｎＷａｎｇＭｉａｏｘｉａ，ａｒｅｓｉｄｅｎｔｏｆＱｉａｏｔｏｕＶｉｌｌａｇｅｉｎＺｈｉｙａｎｇＴｏｗｎｓｈｉｐ，ＳｈａａｎｘｉＰｒｏｖｉｎｃｅ，ｉ...

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简介：ThepaperanalyzesthesedimentsourceofwatershedbymeansofstudyingwatershedinwestemShanxioftheLossesPlateau.Onthebasisofwatershedsclassification,7typicalwatershedswerechosenandobservedfor11years.Theresultshowsthatthesedimentatthesmallwatershedmainlycomesfromgullies,whichis60%ofthetotalsediment.Erosionmodulusofvalley(includinggullyhead,gullybed,valleyside)is1.28-2.48timesasthatoftheareabetweenchannels(includinghillslopeandmoundoftheLoessPlateau).Themainsedimentsourceofslopeerosioniscultivatedlandonslopewithoutwaterandsoilconservationmeasures.

简介：为了确定黄土高原地区现有刺槐林改造的最佳间伐强度，１９９５年秋季对密度为２２２０株／公顷的９年生刺槐林进行了三种不同强度的间伐．通过间伐，降低了群落密度，减少了林冠截留率，增加了植树带内的汇流量，根系层内的土壤水分条件得到明显的改善．当间伐后的林分密度为１１１０株／公顷时，生长季内植树带土壤水分提高约４０％．随着间伐强度的增大，林木的水分生产函数曲线由直线上升变为以对数曲线上升；当间伐强度达到某一值时（保留密度为１１１０株／公顷），林木水分生产力随蒸腾量的变化曲线为抛物线．这表明此时水分已不再是林木生产的限制因子，在这种间伐强度条件下，单株林木和整个林分的水分生产力分别达到６０１７１ｇ·ｋｇ－１·ｍｍ－１和１４９７７７ｋｇ·ｈｍ－２·ｍｍ－１，因此将这一强度定为黄土高原地区刺槐林间伐的最佳强度．

简介：Saturatedhydraulicconductivity(Ks)isanimportantsoilhydraulicparameterforcharacteringtherateofwaterflowacrossthesoilsandismainlyrelatedtoitshighspatialvariability.Inasmallwatershedwiththeareaof0.27km2intheLoessPlateau,Ksof197soilsamplesunderdifferentvegetationsandlandformsweremeasured.Kshadamoderatevariabilityfortotalsamples.TheforestlandhadhighKswithlowcoefficientofvariation(CV),butthegrasslandinthewatershedbottomhadlowKswit...

简介：Timedomainreflectometry(TDR)isahighlyaccurateandautomaticmethodfordeterminationofporousmediawatercontentandelectricalconductivity.ThispaperfocusesonthebasicprincipleofTDRtechnologyanditsapplicationinCaijiachuanwatershed,theLoessPlateau,China,thecompositionandstructureofasetofTDR-TRIME.Theinstallation,measurementandcalibrationofTRIME-TDRintheLoessPlateauhasbeenintroduced.ThefactorsthatcaninfluencetheveracityofthemeasurementbyTDRhavealsobeenanalyzedinthearticle.

简介：黄家二岔小流域地处中国黄土高原水土流失最严重的黄土丘陵沟壑区，自１９８３年以来，该小流域作为小流域治理和农业发展技术的试验示范基地，开展了一系列小流域治理和农业综合发展技术的试验研究工作．本文主要介绍了黄家二岔小流域不同治理阶段所存在的问题、目标、研究思路、内容、技术措施、成果和经验，以期对处在不同发展时期的我国和其他发展中国家的流域治理工作提供参考和借鉴．